Well cleaning device



Junel, 1936. J. T. BARKELEW ET AL.

WELL CLEANING DEVICE 4 Sheets-Sheet 1 Filed Feb. 9, 1955 I 721/6 LarsJrmz Tar/Yelew. JfaraldE Sc'mzllebury June `16, 1936. J. T. BAKELEw ErAL WELL CLEANING DEVICE Filed Feb. 9, 1935 4 .sheets-sheet 2Inl/enlaza?. far/zes ZZ arkelew.

Homey J. T. BARKELEW ET AL June 16, 1936.

v WELL CLEANING DEVICE 4 Sheets-Sheet 3 Filed F'eb. 9, 1935 s ad r.r n@Y00 7 4 v .www om. 2 4 l, 5 I@ Y Magd# n.25 fw 5 5m? m c M md/ @m H w.lw? w.

4 Sheets-Sheet 4 www n fra. dC s. M `fa H WELL CLEANING DEVI CE J. T.BARKELEW ET AL June 16, 1936.

Patented .lune 16, 1936 UNITED STATES PATENT OFFICE wELL CLEANING DEVICEJames T. Barkelew, Pasadena, and Harold E. Scantlebury, Altadena,Calif., assignors to John Grant, Los Angeles, Calif.

Application Februai-y 9, 1935, serial No. 5,774 24 claims. (c1. 16s- 19)This invention hasto do generally with wellI cleaning devices and ismore particularly concerned with such devices wherein there is provideda low-pressure-holding or charge-receiving chamber with a normallyclosed inlet adapted to be opened at predetermined points in the wellwhereby the well uid, under relatively high presfrom the well, it willbe understood the illustrated 20 inlet valve for said chamber and thevalve-control mechanismv may be ,applied with advantage to the inlet ofany type of low pressure chamber, irrespective of the manner in whichthe charged chamber is subsequently emptied or prepared'for re-charge,and therefore the showing `of the invention as embodied in connectionwith a particular type of chamber is not to be considered as limitativeon such broader aspects of the invention.

In this connection it is to be noted that in dislodging foreign matterfrom casing perforations or otherwise promoting fluid ow by setting upfluid movement by the charging of the Areceiving chamber, (asdistinguishedfrombailing) the,

matter sodislodged is ordinarily, but not necessarily, forced into thecharge receiving chamber and subsequently disposed of along with the uidcharge.

The device will here be described as utilized in the cleaning of casingperforations, to which use it is particularly well adapted, but thisparticularized description is not to be considered as in any waylimitative on the adaptability of the device for other cleaningoperations.

y that they may be capable of performing eflicientlyl and surely theservices required. For instance, it is highly important that the inletto the low 55 pressure chamber b e kept tightly closed until theConditions under which it is desirable or neccleaner has reached thepredetermined zone of operation and yet, in spite of that tight closureand in spite o f the usually high iiuid pressure in that zone, the inletmust be capable of practically instantaneous full-opening, under thecontrol of 5 the operator after reaching that zone. Further, the controlmechanism must not only be sure and fast in operation, but, to be fullyelcient, must be of a nature which does not interfere with the rapidlowering or raising of the device to and from the zone of operation.Further, it must present little or no danger of accidentalvalvetripping. A

Therefore it-A is among Athe general objects of .the invention toprovide a cleaner which'shall 15 have the above desirable features, aswell as others which maybe pointed out to better advantage in connectionwith the detailed description to follow.

It may here be pointed out, however, that the present invention embodiesa` novel inlet valvefor the low-pressure chamber, wherein one valveelement overlies a portion of the other valve element to form a seal,both elements being movable with respect to the body member and bothbeing so exposed that well pressure tends to move them upwardly. Theoverlying element; however, is latched down in a manner to resist se,v,it following that such pressure vis effective ni-ovement under theinfluence of the well presset` up relative movement between the elementsin a manner to seat the .underlying element on the latched element.

Accordingly, as the tool is lowered to zones of increased pressure witha consequent increased tendency for leakage between valve parts, thetighter is the valve held closed to resist such leakage, an obviousadvantage. Then, when the overlying element is unlatched after the toolreaches the predetermined zone of operation, well pressure is effectiveto move both elements upwardly, but the upward movement of theunderlying member is checked before that of the overlying element, itfollowing that the elements are Y, relatively parted to open the inletof the low' 45 pressure chamber. y j

Thus, we secure the eiect, entirely novel so far as we are aware, ofutilizing well pressure to maintain a tight closure during descent ofthel tool, and then utilizing that well pressure to open the valve oncethe valve-latch is released. t

In the illustrated embodiment of our invention we haveshown the valveseat as the overlying element which is initially latched against themovement under the influence of well-pressure.

and the valve stopper as the underlying element whose upward movement ischecked before that of the seat when the latter is unlatched. However itwill be understood that this showing is not limitative on the broaderaspects of the invention wherein it is contemplated that either valveelement may occupy one relative vertical position or the other.

We have also provided the valve seat member with a second seatingsurface in opposed relation to the inlet-seat, the single valve-stopperbeing moved into engagement with the second seat after the low-pressurechamber is charged, to act as a foot-valve.

Fig. l is a side elevation of a cleaning device embodying our invention;

Fig. 2 is an enlarged section on line 2-2 of Fig. 1;

Fig. 3 is an enlarged section on line 3-3 of Fig. 1, the showing of theinlet valve member of Fig. 2 being here repeated in order more clearlyto relate certain of the parts;

Fig. 4 is a section on line 4-4 of Fig. 1;

Fig. 5 is a developed view ofcertain cam arrangements used in connectionwith the operation of the cleaner;

Fig. 6 is a view similar to Fig. 5 but showing the cam elements inchanged relative position;

Figs. '1 and 8 are similar to Figs. 3 and 4, respectively, but showingthe position of the parts when the inlet valve is opened; and

Figs. 9 and 10 are views similar to Figs. 7 and 8, respectively, butshowing the position of the parts during withdrawal of the cleaner.

As has been previously stated, the cleaning device is particularly welladapted, but notlimited, to the dislodgment of foreign matter from theperforations of well-casing, and therefore We have illustrated thedevice as positioned within such a perforated casing or screen A havingany suitable type of perforations, here conventionally illustrated at B.o

Body member vC of the cleaningdevice is here shown as made up of aplurality of sections coupled end-to-end, though it will be understoodthe showing of such sectional characteristics is not to be construed aslimitative on the invention.

Threadably connected body or casing sections are indicated at I0, II andI2; section I0 (Fig. 2) serving as a head or top closure for thechargereceiving or low-pressure chamber D which is annularly defined bythose sections. Attachment section I3 is threadably connected to sectionI0 and serves as means whereby the body member may be attached to asuspension element-cable I4, for instance. Section I I, here shown aslongitudinally contracted, may be of any desirable length and may,itself, be sectional. A fort-y foot length gives chamber D a capacityample for most operations.

Section I0 has a reduced axial bore I5 from which extends a transversepassageway I6 controlled by a spring-closed, outwardly-opening reliefvalve generally indicated at I1. The function of this valve is merely torelieve high pressure in the charge-receiving chamber as the tool israised into zones of lower pressure. To facili- Atate unloading ofchamber D, we preferably provide an inwardly, opening, spring-closeddump relief valve at I 8. This valve is fully described and claimed inthe copending application of W. C. Erwin et al. on Well bailers, filedApril 22, 1933, Ser. No. 667,439, wherein the showing of the valve issubstantially identical with the present showing. It will suflice hereto state that removable screw plug I9 normally closes passageway 20.When chamber D is to be unloaded, plug I8 is removed and passageway 20is then adapted to put that chamber into communication with theatmosphere when the negative pressure therein (as created by the dumpingof the iiuid) is of a value allowing spring-closed valve I8 to openunder atmospheric pressure.

While, as will appear, chamber D may be unloaded by opening a valvewhich has dual capacity as an inlet closure and foot-valve, we have hereillustrated an unloading door independent of and above said valve, thechoice as to which dumping means shall be employed lying with theoperator. The illustration of these two dumping mediums therefore is notto be considered as limitative of one or the other or as indicating thatboth are necessary.

The auxiliary dump is here shown as a removable door 2I provided insection I2, the construction and mounting of this door being dulydescribed in said copending application Ser. No. 667,439, wherein theshowing is substantially the same as herein indicated, and whichapplication also contains claims to these features. The door lis openedby loosening screws 22 (which normally press the door inwardly tocompress gasket 23 and thus provide a fluid-tight seal), and thensliding the door transversely to clear lugs 24 from overhanging lips 25,which latter define way 26.

Screwed into and depending from section I2 is tubular section 21 whichmay be considered a part of body member C or as an extension thereof. Avalve-assembly generally indicated at V is provided in the upper end ofsection 21, this assembly being adapted to function alternately as aninlet valve and a foot-valve for chamber D, as will appear, though thisdual capacity is not to be considered as limitative on certain aspectsof the invention.

Reduced-diameter tubular section 28 is screwed into the lower end ofsection 21, serving as a depending extension thereon. A sleeve,generally indicated at 29, is made up of threadably connected sections30 and 3I which are longitudinally slidable on body-sections 21 and 28,respectively. Coupled at 32 to sleeve-section 3| is a tubular extension33 having lateral intake ports 34 which open to intake duct G (made upof the communicating bores of tube 33 and sections 3 I ,'28 and 21)leading to valve V. A shoe or guiding nose 35 on tube 33 closes thelower end of duct G and is preferably fiuted at 36 so well-fluid maypass with minimum interference between the well casing and shoe as thetool is raised or lowered, to obvious advantage.

For controlling or effecting the opening of valve V we provide a member31 mounted for movement longitudinally with respect to body C andengageable with well casing A, plus an operative connection between thatmember and valve V whereby movement of the member with relation to thebody sets up or controls movement of the valve. In this particular case,member 31 is carried on sleeve-section 3|, and since the latter istelescopically arranged with respect to body-sec- Since we have chosenhere to show the inveningv effect therebelow and particularly at intakeports 34, we have indicated the utilization of member 31 both as theelement which is operatively connected to the valve for controlling oreffecting the opening thereof, and as a packer. However it will beunderstood that the invention, considered in its broader aspects, is notlimited to having member 31 constructed to have this packing function.

With member 31 in the form of a packer positioned above intake ports 34(whereby the zone of operation is isolated from the fluid-column in thewell casing above member 31 so the effect of a sudden charging ofchamber D is more or less 'localized about the intake ports) it will beseen that the packer obstructs the space between the cleaner andwell-casing and, when the packer is moved upwardly, the fluid columnthereabove tends to expand it radially into tighter frictionalengagement with the well-casing..v

Accordingly in raising or lowering the cleaner it is vdesirable toby-pass the fluid around the packer, but since we have here shown duct Gserving both as an intake passage leading to the inlet valve and as partof the by-passage, it becomes desirable that when the duct is used forintake purposes the by-pass ports opening to that vduct above thepackerbe closed off. This prevents well-uid from being drawn inwardly'through the by-pass ports from outside the isolated intake zone, whichotherwise would minimize the localizing effect within that zone whenchamber D is suddenly opened to receive a charge.

Therefore, in the preferred embodiment of our invention, we have shownmeans operable to close the by-pass ports and have given member 31 theadditional function of operating that closure, as will be described. Itis to be noted, however, that the following described particularities ofmember 31 and the by-passage control are not to be considered aslimitative on the broader aspects of the invention.

Member 31 is here illustrated as a packer of a type well known in theart, `consisting of an upwardly opening cup 38 of rubber or othersuitable resilient material held against sleeve-shoulder 39 bycup-member 4U, the latter being held, in turn, by coupling 32. Cup 38may be reenforced by spring wire eil. Hereinafter, member 31 will bereferred to as a packer, but this reference is subject to thereservations noted above.

Valve-assembly V includes a seat-member, generally indicated at 632, inthe form of a tube capable of limited longitudinal movement and rotationwithin the bore of the body section 21. It will appear, however, lthatsince member 52 is movable to and from closing position, that member mayalso be considered a movable closure member. The seat-member ismade upof threadably connected sections 43 and 111i between which is clamped aring-packing '45, preferably cornprising a downwardly openingcup-leather in tight peripheralengagement with sections 21 and 13, any:duid under pressure reaching the cup from beneath tending to expand itradially into tighter sealing engagement with the opposed` walls. At thetop of tube-section 2:1 and posiv tioned by nut d5, is a similarring-packing d1,

but here the cup-leather opens upwardly so fluid pressure from abovetends to expand it radially into sealing engagement with the opposedperipheral walls of sections 21 and 55.

Projecting radially from the lower end of tubesection 43 are cam pins 48which extend through angular cam slots 49 and 50 in body-section 21 andsleeve-section 30, respectively, slots 5Ilprefv lerably being closed atthe outer face of section 5 30 by protector-sleeve 5l welded orotherwise suitably secured to that section.

Preferably, pins 48 extend through slide-blocks 52 which have nicesliding-fit in cam slots 49, the latter inclining at about theslip-angle as pre- 10 determined by the particular forces and surfacesof contact involved. Cn the other hand, each slot has substantiallyvertical portions 53 and 54 at bottom and top, respectively and aninclined connecting portion 55 of considerably steeper an- 15 glethanthat of slot 49. yWhen valve V is closed, l (Fig. 3) the cam pins are atthe bottom of slots 5l! and blocks 52 are at or near the bottom of slots49.

Secured tol and projecting inwardly from sleeve 2o section 30 andextending through vertical slots 56 in body'section`21, are pins 51which support a stop collar 55, the purpose of which will later appear.The pins, in addition to their collarsupporting function, serve as keyswhich, in cooperation with slots 56, permit limited relativelongitudinal telescopic movement between body section 21 and sleevesection 30 but prevent relative rotation thereof, it following thatduring telescopic movement of the sections slots 59 and 50 30 have norelative rotation but shift vertically with respect to one another(Figs. 5 and 6).

Tube-sections 53 and llhave internal flanges 59 and 60, respectively,which define outlet opening 6l and inlet .opening 62, respectively, ofthe 35` low-pressure chamber. The flanges present vertically spaced,opposed seats B3 and tf1 between which valve-stopper or closure isadapted to play, the closure having faces 56 and 61 adapted to. havefluid-tight fit withseats t3, 64, respec- 40 tively, during certainstages of valve operation.

Closure stem t8 extends with sliding fit through spider 69, carried bybodyisection 21, and through collar 58, supported from sleeve-section 30by pins 51, as has been described. Stem 68 has three 45 collars 10, 1land 12 positioned with relation to spider 63 and collar 58 in the mannerclearlyv shown in Fig. 3. Compression spring 13, interposed betweencollar 1li and spider 59, tends to hold closure 55 .upwardly withshoulders G1 and 50 in engagement, being depended upon to hold the inletvalve closed only Auntil well pressure takes over the duty, as willappear.

In describing the operation of the tool it will first be assumed it isin the condition of Figs. 55 v l to 5, inclusive,- that is, ready to belowered to the zone of operation. In this condition it will be notedthat by-pass ports 1t and 15 (provided in body-section 23 and sleeve.section 3l, respectively, at points above packer 31) are in reg- 60istration (Fig. ll) it following that, during descent of the tool,well-fluid may by-pass around the packer through ports Sli, duct G andports 1d,

15. The frictional engagement of packer 31 with well-casing A tends toretard downward move- 65 ment of sleeve 2Q and thus tends to hold thetelescopic joint between body member C and sleeve .29 relativelycontracted'as the body member is lowered. Shoulders 15, defining theupper end's of slots '55, engage pins 51 to limit the extent of thiscontraction and ultimately serve to thrust the sleeve and hence packer31 downwardly through the well-casing.

lt will be seen that seat member i12, when released, is capable ofmoving upwardly with re- 3*'5l spect to body section 21 to an extent a(Fig. 5) that is, a distance substantially equal to the extent oftherelative vertical displacement of the ends of a given slot 49.However, since member 42 cannot thus move upwardly without coincidentrotation (due to the coaction of the cam pins and slots 49) and sincethe entry of pins 48 in vertical portions 53 of cam slots 50 preventsuch rotation, the seat member is, in effect, latched in the position ofFig. 3.

The relatively small vertical clearance (less than distance a) betweencollar 1I and spider 69 represents the extent' of ultimate upwardmovement allowed to closure 65. This clearance allows full seating ofclosure 42, under the infiuence of spring 13 or of upwardly directeduidpressure, on face 64 of the latched-down seat member and is of anextent to compensate for reasonable wear of contacting faces of thevalveparts. y

When the well-uid is entered, well-pressure is effective against thelower ends of seat member 42 and closure 65 in a manner tending to moveboth of them upwardly or, more broadly expressed, toward chamber D, fortheir upper ends are eX- posed to the relatively low or `atmosphericpressure in that chamber D. However, since seat member 42 is positivelylatched down, well-pressure is effective to an extent measuredapproximately by the differential in pressure at opposite sides ofclosure 65 and over a surface equal to the cross-sectional area of inlet62 to hold the closure tightly seated on face 64, the effectivevalve-closing pressure increasing as the tool reaches greater depths andthus off-setting the increasing leakage tendencies.

When the cleaner reaches the zone of operation, descent of the tool ischecked and limited withdrawal movement is imparted thereto byreeling-in cable I4. Since packer 31 resists upward movement, due to itsfrictional engagement 4with well casing A, body sections 21 and 28 aremoved upwardly with relation to sleeve 29. While camV pins 48 are thusbeing lifted through the vertical portions 53 of sleeve-slots 50, thereis no change in the relative position of the valve-parts but bodysection 28 is lifted suciently to close by-pass ports 15 and thus renderthe by-passing ineffective so, when valve V is subsequently opened, thecleaningeffect will be localized about intake ports 34.

As cam pins 48 ride out of slot portions 53 into inclined portions 55.they are freed for movement through body-section slots 49, that is, tothe left as viewed in Fig. 5. The angle of a given slot 49 is preferablyapproximately equal to the predetermined slip-angle, so continued upwardpull on the body member tends to rotate seat member 42 and thus allow itto move upwardly with respect to body section 21, the inclined portions55 of sleeve-slot allowing such movement'of the cam pins. Or, if slot 49be inclined at less than the slip-angle the right hand defining wall (asviewed in Fig. 5) of slot portions 55 may be utilized as cam shouldersfor forcing the cam pins through slots '49. Slots 49 linut the extent ofupward movement of member 42. v

Aidng in the elevation of sleeve member 42,

` or, if the cam slots be of proper angle, actually being depended uponfor elevating the seat member, is the well-pressure directed against theunderside of said seat member. The iluid pressure directed against theunderside of closure 65 is also initially effective in aiding or causingupward movement of the seat member but when collar 1I engages theunderside of spider 69 upward movement of closure 65 is checked whilemember 42 continues to rise, thus raising seat 64 from closure 65 andopening inlet 62 (Fig. 7

Well-fluid is then free to rush through ports 5 34, duct G, the bore ofsleeve 42, and inlet 62 into the low-pressure chamber D, the fluidcarrying with it foreign matter (which is to be bailed). Where thedevice is used as a perforation cleaner, the in-rush sets up such move-10 ment in the well uid surrounding the tool below the packer as todislodge slugs of foreign matter in the perforations of the well casing.The slugs (which are sometimes broken up by the uid action and sometimesare removedintact) 15 usually, though not necessarily, are carried intochamber D along with the in-rushing fluid.

With inlet valve V opened, as in Fig. 7, it will be seen that cam lugs48 are in line with vertical portions 54 of cam slots 50 and that thelower- 20 most stem-collar 12 engages the underside of stop-collar 58.Accordingly.' upon continued withdrawal movement of body C, closure 65is held from further upward movement by collar 58 while seat-member 42rises with body section 21 25 -(the relative movement between the sleeve29 and of closure 65 to close outlet opening 6I, valve V 30v 'thereafterserving as a foot-valve to retain the charge in chamber D (Figs. 9 andl0). During the withdrawal movement which accomplishes the shifting ofclosure 65 from the position of Fig. to that of Fig. 9, body section 28has been drawn 35 above by-pass ports 15 (Fig. 10) it resulting thatupon subsequent elevation of the charged cleaner, well fluid is againfree to by-pass the packer.

When the parts are in the position of Figs. 40 9 and 10, (the chargingbeing completed and the by-pass fully open) sleeve 42 is, in eiect,latched in its uppermost position with respect to body section 21, forit cannot travel downwardly without rotation with respect to section 21and this 45 rotation is prevented by the presence of cam lugs 48 invertical portions 54 of sleeve-slots 50 (Fig. 6). With member 42 held inits uppermost position with respect to section 21 and with closure 65engaging seat 63, continued upward movement 50 of body C acts throughstem 68, head 12, collar 58 and vpins 51 to drag sleeve 29 and packer 31upwardly along with the body.

During the elevation of the charged cleaner, there arises a differentialbetween the internal 55 and external pressures imposed on the cleanerbody, but relief valve I1 allows a bleeding of chamber' D to reduce thehigher internal pressure and thus eliminate danger of bursting andallows subsequent unloading without danger or in- 60 convenience to theoperator.

After the cleaner is. fully withdrawn from the well, chamber D may beunloaded in either of two ways. For instance, door 2| may be opened to'discharge the material thereabove, such built- 65 up internal pressureas remains in the chamber and generally as measured by the strength ofthe relief-valve spring, giving the material an initial outward impulse.To prevent a substantial negative pressure from developing in the cham-70 ber which would otherwise prevent complete unloading, plug I9 may bremoved to permit innow of air through valve I8 to the top of chamber D.Or the unloading may be accomplished as follows: with shoe 35 resting onthe derrick iioor 75 rao or the bottom of a. receiving-sump, body C islowered to a position where, due to the relative longitudinal ortelescopic contraction of the body and sleeve 29, seat member 42 hasbeen cammed down with relation to section 2l and closure 65,

outlet 6| thus being opened to permit discharge f from .chamber Dthrough duct G and ports 34. When the chamber is emptied, all parts ofthe device are returnable to the positions of Fig. 3 ready to receive anew charge.

While we have illustrated and described the preferred embodiment of ourinvention, it will be understood this is to be considered asillustrative of and not limitative on the broader aspects of theinvention, for various changes in design, structure and arrangement maybe made without departing from the spirit and scope of the appendedclaims.

We claim: l. In a well-cleaning device, a body having a low-pressurechamber and an inlet therefor, a

seat member and a closure member cooperating to control fluid-nowthrough the inlet, both said members being movable upwardly with respectto said body, and being individually movable ver-l tically with respectto eachother to open the inlet.

2. In a well-cleaning device, a body having a low-pressure chamber andan inlet therefor, a seat member and a closure member cooperating tocontrol duid-flow through the inlet, both said members being movableupwardly with respect to said body, and being individually movablevertically with respect to each other to open the inlet, and releasablemeans adapted to -holdsaid members against such movement.

3. In a well-cleaning device adapted to belowered through a well casing,a body having a lowpressure chamber and an inlet therefor, a seat memberand a closure member cooperating to control duid-flow through the inlet,both said members being movable upwardly with respect to said body, andbeing individually movable vertically with respect to each other to openthe inlet, and means shiftably carried on the body and operativelyconnected to one of said members to releasably hold the members againstsuch movement, said holding means being adapted to be released by virtueof predetermined movement of the body with respect to the casing.

4. In a well-cleaning device adapted to be lowered through a Wellcasing,a body having a lowpressure chamber and an inlet therefor, a seat memberand a closure member' cooperating to control fluid-flow through theinlet, both said members being movable upwardly with respect to saidbody, and being individually movable vertically with respect to eachother to open the inlet, and means shiftably carried on the body andengaging the casing, said means being 'operatively connected to one ofsaid members to releasably hold the members against such movement, saidholding means being adapted to be released by virtue of withdrawalmovement of the body with respect to the casing.

5, In a well-cleaning device, a body having a low-pressure chamber andan inlet therefor, a seat member having a pair of vertically spaced andopposed seats, and a closure member between the seats, both said membersbeing movable upwardly with respect to the body and said members beingindividually movable with respect to each other to engage the closuremember sevmembers being upwardly movable with respect `to the body underthe influence of well-pressure chamber, a downwardly facing annular seaton low-pressure chamber and an inlet therefor, a. seat member having apair of vertically spacedl and opposed seats, a closure member betweenthe seats, both said members being movable upwardly with respect to thebody and said members 5 being individually movable with respect to eachother to engage the closure member selectively with said seats,releasable means adapted to hold said members against up-ward movementwith the closure engaging the upper seat, and means 10 operative aftersaidholding means is released to move said closure to the lower seat.

7. In a well-cleaning device, a body having a low-pressure chamber andan inlet therefor, a valve for lsaid inlet, releasable means associated15 with the v'alve to render well-pressure normally effective to holdthe valve closed, and means operative upon the release of the iirstmentioned means to render well-pressure effective to open the valve. i20 8. In a well-cleaning device, a body having a low-pressure chamberand an inlet therefor, a valve for the inlet and embodying a seat memberand a cooperating closure member, both said members being movableupwardly with respect to 25 the body member under the inuence ofwellpressure, releasable means associated with one of Y the members tohold it against upward movement and thereby rendering well-pressureeffective to close the valve, and means eil'ective upon release Vof therst mentioned means to vstopupward releasably limited in its upwardmovement, and 45 l means eiectivewhen said one member is moved upwardlyto stop upward movement of said other member in a position spaced belowsaid one member in its elevated position.

10. In a well-cleaning device, a body havinga 504,

low-pressure chamber and an inlet therefor, a' seat-member and aclosure-member cooperating to control fluid-flow through the inlet, bothsaid directed thereagainst,l releasable means adapted to hold saidseat-member against such movement, the closure member engaging theseat-member when the latter is so held and being thereby releasablylimited in its upward movement', and means effective when saidseat-member is movedupwardly to stop upward movement of said closuremember in a position spaced below said seatmember in its elevatedposition.

l1. In a well-cleaning device, a body having a 65 low-pressure chamber,a seat member embodying a tube having sliding t in a'body-bore below andwith its bore in communication with the the` tube, releasable meansholding the tube against upward movement in the body-bore, a closurebelow and kmounted for vertical movement with respect to the seat, thelower ends of the tube and closure being adapted to be exposed bv towell-pressure and the closure normally en- @5i gaging the seat, meansfor releasing the holding means to allow upward movementl of the tubeand closure under the influence of well-pressure, and a stop on the bodylimiting the extent of upward movement of the closure to less than thatof the tube. l

12. In a. well-cleaning device, a body having a low-pressure chamber, aseat member embodying a tube having sliding t in a body-bore below andwith its bore in communication with the chamber, vertically spaced,opposed annular seats in the bore of the tube, releasable means holdingthe tube against upward movement in the body-bore, a closure in thetube-bore between the seats and mounted for vertical movement withrespect thereto, the lower ends of the tube and closure being adapted tobe exposed to well-pressure and the closure normally engaging the upperseat, means for releasing the holding means to allow vupward movement ofthe tube and closure under the influence of well-pressure, a stop on thebody limiting the extent of upward movement of the closure to less thanthat of the tube, and means for subsequently moving the closure intoengagement with the lower seat.

13. In a well-cleaning device, a body having a low-pressure chamber, aseat-member embodying a tube mounted for vertical movement through abody-bore below the chamber, the tube-bore being in communication withsaid chamber, a downwardly-facing annular seat on the tube, a sleevemounted on the exterior of the body lfor limited longitudinal movement,a pin on the tube and extending through angular slots in the body andsleeve, all in a manner whereby relative longitudinal movement of thebody and sleeve allows relative longitudinal movement between the bodyand tube; a closure below and mounted for relative vertical movementwith respect to the tube to open and close the tube-bore at the seat,and means on the body limiting the extent o f upward movement of theclosure to less than that of the tube.

14. In a well-cleaning device adapted to be lowered through awell-casing, a body having a low-pressure chamber, a seat-memberembodying a tube mounted for vertical movement through a body bore belowthe chamber, the tube-bore being incommunication with said chamber, adownwardly facing annular seat on the tube, a sleeve mounted on theexterior of the body for limited longitudinal movement, a pin on thetube and extending through angular slots in the body and sleeve, all ina manner whereby relative longitudinal movement of the body and sleeveallows relative longitudinal movement between the body and tube, meanson the sleeve and engageable with the well-casing to effect suchrelative longitudinal movement upon withdrawal movement of the body, aclosure below and mounted for relative vertical movement with respect tothe tube to open and close the tube-bore at the seat, and means on thebody limiting the extent of upward movement of the closure to less thanthat of the tube.

15. In a. well-cleaning device, a body having a low-pressure chamber, aseat-member embodying a tube mounted for vertical movement through abody-bore below the chamber, the tubebore being in communication withsaid chamber, a downwardly-facing annular seat on the tube, a sleevemounted on the exterior of the bodyA for limited longitudinal movement,a pin on the tube and extending through a pair of angular Slotsprovided, one each, in the body and sleeve, the sleeve-slot having alower portion extending parallel to the sleeve axis, a closure below andmounted for relative vertical movement with respect to the tube to openand close the tube-bore at the seat, said pin being in said lowerportion of the sleeve-slot when the closure is in bore-closing position,and means on the body limiting the extent of upward movement of theclosure to less than that of the tube.

16. In a well-cleaning device, a body having a. low-pressure chamber, aseat-member embodying a 'tube mounted for vertical movement through abody-bore below the chamber, the tube-bore being in communication withsaid chamber, a downwardly-facing annular seat on the tube, a sleevemounted on the exterior of the body for limited longitudinal movement, apin on the tube and extending through a pair of angular slots provided,one each, in the body and sleeve, the sleeve-slot having upper and lowerportions extending parallel to the sleeve axis a closure below andmounted for relative vertical movement with respect to the tube to openand close the tube-bore at the seat, said pin being in said lowerportion of the sleeve-slot when the closure is in bore-closing positionand in said upper portion of the sleeve slot when the closure is out ofboreclosing position, and means on the body limiting the extent ofupward movement of the closure to less than that of the tube.

17. In a well-cleaning device, a body having an external packer andhaving a low-pressure chamber and an inlet thereto, there being abypassage around the packer, a valve for said inlet, releasable meansassociated with the valve to render well-pressure normally effective tohold the valve closed, said by-passage being open when the valve isclosed, means shiftable on the body and effective rst to close theby-passage and then to free said releasable means, and means operativethen to render well-pressure eiective to open the valve.

18. In a well-cleaning device, a body having an external packer andhaving a low-pressure chamber and an inlet thereto, there being abypassage around the packer, a valve for said inlet, releasable meansassociated with the valve to render well-pressure normally eiective tohold the valve closed, said by-passage being open when the valve isclosed, means shiftable on the body and effective rst to close theby-passage and then to free said releasable means, and means operativethen to render well-pressure eiective to open the valve; said shiftablemeans subsequently being eiective to re-open the bypassage.

19. In a well-cleaning device, a body having a vertically extendinglow-pressure chamber and an inlet for the chamber near one end thereof,a seat member and a closure member cooperating to control fluid-flowthrough the inlet, both said members being movable vertically withrespect to said body towards the low-pressure chamber, and beingindividually movable vertically with respect to each other to open theinlet.

20. In a well-cleaning device, a body having a vertically extendinglow-pressure chamber and an inlet for the chamber near one end thereof,a seat member and a closure member cooperating to control fluid-nowthrough the inlet, both said members being movable vertically withrespect to said body towards the low-pressure chamber, and beingindividually movable vertically with a seat member having a pair ofvertically spaced respect to each other to open the inlet, andreleasable means adapted to hold said members against such movement.

21. In a well-cleaning device, a body having a vertically extendinglow-pressure chamber and an inlet for the chamber near one end thereof,a seat member and a closure member cooperating to control fluid-nowthrough the inlet, both said members being movable vertically withrespect to said body towards the low-pressure chamber, and beingindividually movable vertically with respect to each other to open theinlet, and means shiftably carried on the body and operatively connectedto one of said members to releasably hold the members against suchvmovement, said holding means being adapted to be released by virtue ofpredetermined movement of the body with respect to the casing.

22. In a well-cleaning device, a body having a vertically extendinglow-pressure chamber and an inlet for the chamber near one end thereof,

' dividually movable with respect to each other to engage the closuremember selectively with said seats.

`23. In a well-cleaning device, a body having a. vertically extendinglow-pressure chamber and an inlet for the chamber near one end thereof,

and opposed seats, and a closure member between the seats, both saidmembers being `movable with respect to the body towards the low-pressurechamber, and said members being individually movable with respect toeach other to engage the closure member `.selectively with saidvseats,releasable means adapted to hold said members against movement towardthe low-pressure chamber with the closure engaging one of the seats, andmeans operative after said holding means is releasedto move said closureto the other seat.

24. In a well-cleaning device, a body'having a vertically extendinglow-pressure chamber and an inlet for the chamber near one end thereof,a valve for the inlet, said valve embodying a seat member and acooperating closure member,

both said members being movable with respect to the body member towardsthe low-pressure chamber under the influence of well-pressure,releasable means adapted to hold one of the members against movementtoward the low-pressure chamber and thereby rendering Well-pressureeffectivel to close the valve, and means effective upon release o f theiirst mentioned means to stop movement of one member towards thelowpressure chamber ahead of the other member and thereby renderwell-pressure effective to open the valve.l y

JAMES T. BARKELEW.

HAROLD E. SCAN'ILEBURY.

